CHICAGO (AP) — The Latest on a shooting at a Chicago hospital (all times local):

10:25 p.m.

Mercy Hospital has identified two members of its staff killed in a shooting that left four dead, also including the gunman and a police officer.

Emergency room physician, 38-year-old Dr. Tamera O’Neal, was described as a fascinating, hardworking person. Hospital officials said that O’Neal never worked on Sunday because of her religious beliefs.

Police say O’Neal was confronted in the hospital parking lot by the gunman, with whom she had been in a domestic relationship. Witnesses say the man shot her and she fell to the ground. The gunman then stood over her and shot her again.

Hospital officials say 25-year-old pharmaceutical assistant Dayna Less, who was in training to become a pharmacist, was also killed. According to police Superintendent Eddie Johnson, the woman was shot as she stepped from an elevator. She was a recent Purdue University graduate.

Also killed was 28-year-old Chicago Police Officer Samuel Jimenez, the father of three children.

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8 p.m.

Chicago Police Superintendent Eddie Johnson says the four dead in the shooting at Mercy Hospital include two hospital employees, a Chicago police officer and the suspected gunman.

Mayor Rahm Emanuel says the two hospital employees were a doctor and a pharmacy assistant.

Johnson says the shooting began outside the hospital with a “verbal altercation” in the parking lot between people who knew each other. A friend tried to intervene and the suspected gunman pulled up his shirt and showed a weapon. Gunfire erupted and the shooter ran inside the hospital, where police confronted him.

He says that one of the women killed was in a domestic relationship with the gunman.

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7:40 p.m.

The Cook County Medical Examiner’s office says it has been notified that four people have died in the shooting at Chicago’s Mercy Hospital & Medical Center.

The Chicago Police Department says Monday that one of its officers was shot in the attack and later died at a hospital.

Earlier, witnesses said a gunman repeatedly shot a woman near a parking lot outside the building before entering the hospital and opening fire. Police say. Police say the suspected gunman is dead, but it’s unclear if he took his own life or was killed by police.

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6:30 p.m.

Chicago police have secured a hospital following a shooting that left the suspected gunman dead and four others critically wounded.

Mercy Hospital & Medical Center released a statement late Monday afternoon saying police officers have secured the facility and that patients are now safe.

Witnesses say a gunman repeatedly shot a woman near a parking lot outside the building before entering the hospital and opening fire Monday afternoon .

Police say an officer and at least one hospital employee are among the four people critically wounded in the attack. Police say those patients are being treated at other hospitals.

Police say the suspected gunman is dead, but it’s unclear if he took his own life or was killed by police.

Police haven’t released details about the suspected gunman, the victims or a possible motive.

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5:35 p.m.

A witness says he saw a gunman repeatedly shoot a woman outside a Chicago hospital before making his way inside and opening fire.

James Gray tells KABC-TV he was inside Mercy Hospital on Monday when the shooting unfolded . He described the scene as “mass chaos.”

Gray says the man was walking with a woman near a parking area when he turned and shot her in the chest multiple times. He says the man then stood over the woman and continued shooting.

Gray says the man then entered the hospital, and “just started shooting at random.”

Chicago police say the suspected gunman was later killed. Police say four people were critically wounded, including a police officer and at least one hospital employee.

Police issued an earlier statement saying there were “reports of multiple victims” after shots were fired near the hospital on Chicago’s South Side.

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5 p.m.

Police say the suspected gunman is dead and four people are in critical condition following a shooting at a Chicago hospital.

Chicago police spokesman Anthony Guglielmi says a police officer and at least one hospital employee are among those hospitalized in critical condition following the Monday afternoon shooting at Mercy Hospital.

Guglielmi says the gunman was killed, but it’s unclear if he took his own life or was killed by police.

The department issued a statement earlier on Twitter saying there were “reports of multiple victims” after shots were fired near the hospital on the city’s South Side. Police are asking people to avoid the area.

A spokesman for Mayor Rahm Emanuel says the mayor and Police Superintendent Eddie Johnson are monitoring the situation.

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4:15 p.m.

Chicago police say an officer has been shot during an active-shooting incident at a hospital on the city’s South Side.

Police spokesman Anthony Guglielmi says the officer is in critical condition. He says one “possible offender” has also been shot, and that officers are now searching the hospital.

The department issued a statement on Twitter saying there were “reports of multiple victims” after shots were fired Monday afternoon near Mercy Hospital. Police are asking people to avoid the area. No other details were immediately released.

A message left for hospital officials wasn’t immediately returned.

Television footage shows several people, including some wearing white coats, walking through a parking lot with their arms up.

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4 p.m.

Chicago police say officers are searching a hospital after a reported shooting and that one “possible offender” has been shot.

The department issued a statement on Twitter saying there are “reports of multiple victims” after shots were fired Monday afternoon near Mercy Hospital on the city’s South Side.

Police spokesman Anthony Guglielmi says officers are searching the hospital. He says at least one “possible offender is shot,” but no details were immediately released. Police are asking people to avoid the area.

A message left for hospital officials wasn’t immediately returned.

Television footage shows several people, including some wearing white coats, walking through a parking lot with their arms up.

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3:50 p.m.

Chicago police say they are responding to a shooting near a Chicago hospital with “reports of multiple victims.”

A department spokesman issued a statement on Twitter saying officers are responding after shots were fired near Mercy Hospital on the city’s South Side. The department says there are “reports of multiple victims.”

The police department says it didn’t immediately have more details. A message left for hospital officials wasn’t immediately returned.

Law enforcement officials work near Mercy Hospital in Chicago, Monday, Nov. 19, 2018. A shooting at the Chicago hospital has wounded multiple people, including a suspect and a police officer, authorities said. Shots were fired Monday, at Mercy Hospital on the city's South Side, and officers were searching the facility. Police issued a statement on Twitter saying there were "reports of multiple victims." (Zbigniew Bzdak/Chicago Tribune via AP)